A report criticises the denial of rights to those dealt with by private firms on behalf of the Immigration Service.
The Border and Immigration Agency's Complaints Audit Committee's report, for 2006/07, says investigations into misconduct complaints have been "poor".
Only 8% of complainants were interviewed and 89% of investigations were "neither balanced nor thorough".
As a result, 83% of replies were "indefensible".
Some 71% of misconduct complaints were not completed within time targets.
In 95% of cases, those investigating the complaints had been from the companies under investigation.
Of those misconduct complaints received, 19% were over criminal behaviour - up from 12% in 2005/06.
The report says serious misconduct complaints remain a source of "grave concern to us because of the risks of injury or death, wrongful arrest and civil liability arising from the arrest, detention and removal of failed asylum seekers".
One asylum seeker, Apollo Okello, told the BBC he had been bundled onto a plane at Heathrow and refused permission to see his lawyer, with the security guards knowing he already had permission to stay in the UK. He struggled and was beaten up in the back of a van .
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